Tirta ErMnO3 optinės savybės: apskaičiuotos dielektrinių skvarbų spektrinės priklausomybės, optinių šuolių energijos, lūžio ir sugerties rodikliai. Tyrimai atlikti elipsometru, dielektrinė funkcija apskaičiuojama pagal vienašio kristalo modelį. / Manganites have attracted a lot of attention due to their magnetical properties: colossal magnetoresistance, variety of phase, but the optical properties of ErMnO3 were not widely investigated. Investigation of optical properties of ErMnO3 single crystal were studie by means of ellipsometry method. Ellipsometric studies have been carried out in the spectral range of 1- 5 eV. The photimetric ellipsometer with rotating analyzer was used. Experimental ellipsometer data were analysed in the isotropical and uniaxial crystal models. The optical properties of ErMnO3 were investigated: ellipsometric parameters Ψ and Δ were determinated, the components of dielectric function and energy of optical transition were found, calculated refractive and absorption indexs.